5"/54 caliber Mark 45 gun
The 5-Inch/54-caliber (Mk 45) lightweight gun is a modern U.S. naval artillery gun mount consisting of a 5-inch (127 mm) L54 Mark 19 gun on the Mark 45 mount. It is designed to be used against surface warships, for anti-aircraft use and shore bombardment to support amphibious operations.
The gun mount features an automatic loader with a capacity of 20 rounds. These can be fired under full automatic control, taking a little over a minute to exhaust those rounds at maximum fire rate. For sustained use, the gun mount would be occupied (below deck) by a three-man crew (gun captain, panel operator, and ammunition loader) to keep the gun supplied with ammunition.
Development started in the 1960s as a replacement for the 5-inch/54 Mark 42 gun system with a new, lighter, and easier to maintain gun mounting. In USN use, the Mark 45 is used with either the Mk 86 Gun Fire Control System or the Mk 160 Gun Computing System. Since before World War II, 5" has been the standard gun caliber for U.S. Naval ships. Its rate of fire is lower than the British 4.5-inch (114 mm) gun, but it fires a heavier 5" shell, and carries a larger burst charge which increases its per-shell effectiveness against aircraft.
- Mod 0: used mechanical fuze setter. Two piece rifled construction, with replaceable liner
- Mod 1: electronic fuze setter replaces the mechanical one. Made with a unitary construction barrel, which has a life span approximately twice that of the Mark 42 gun.
- Mod 2: export version of Mod 1, but now used in the US Navy
- Mod 3: same gun with a new control system; never put into production
- Mod 4: longer barrel (62 calibers in length versus 54) for more complete propellant combustion, higher velocity and greater utility as a land attack weapon.
In sustained firing operations (Mode III), the gun is manned by a three-man crew all located below decks. These are a gun captain, a panel operator, and ammunition loader. In fully automatic non-sustained firing operations (Mode IV), the gun can be fired without any personnel inside the mount. However, sustained fire is limited to the capacity of the automatic loader (20 rounds).
- Arleigh Burke-class destroyer guided missile destroyer:
- Ticonderoga-class guided missile cruisers: mod 2
- CG-52: mod 4 after receiving the cruiser modernization
- Tarawa-class amphibious assault ships (later removed)
- Absalon-class command and support ships
- King Sejong the Great-class guided missile destroyer: mod 4
- Chungmugong Yi Sun-sin-class guided missile destroyer: mod 4
- Salih Reis-class frigates (MEKO 200 TN II-B)
- Barbaros-class frigates (MEKO 200 TN II-A)
- Yavuz-class frigates (MEKO 200 TN)
- 12px Media related to 5"/54 caliber Mark 45 gun at Wikimedia Commons
- Extended Range Guided Munition
- 4.5 inch (114 mm) Mark 8 naval gun: The equivalent gun on British ships, being upgraded to 155 mm
- Otobreda 127/54 Compact: An Italian weapon system, with the same caliber
- Advanced Gun System—new 155 mm long-range gun for the Zumwalt destroyers
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